Mat mat1, mat2, mat3, mat4;
    namedWindow("Color");

    int saturation = 0, hue = 0, value = 0;

    createTrackbar("Hue", "Color", &hue, 180);
    createTrackbar("Saturation", "Color", &saturation, 255);
    createTrackbar("Value", "Color", &value, 255);

    while (true) {
        mat1 = Mat(800, 600, CV_16UC3, Scalar(hue, saturation, value));
        mat1.convertTo(mat1, COLOR_BGR2HSV);
        imshow("Color", mat1);
        if (waitKey(30) == 27) //wait for 'esc' key press for 30ms. If 'esc' key is pressed, break loop
        {
            cout << "esc key is pressed by user" << endl;
            break;
        }
    }
    destroyAllWindows();